Related by context. Frequent words. (Click for all words.) 77 isotopic composition 74 oxygen isotopes 70 isotopic 70 abundances 66 foraminifera 63 marine sediments 63 zircons 61 olivine 61 chemical composition 60 solar nebula 60 aerosol particles 59 spectral signature 59 basalts 59 lavas 59 stable isotope 59 oxygen atom 59 nitrogen fixation 59 radiocarbon 59 basaltic 59 radioactive decay 58 morphologies 58 nuclei 58 morphology 58 atmospheric methane 58 microfossils 58 spherules 57 stromatolites 57 hydroxyl 57 atmospheric CO 57 diatom 57 morphologically 56 lake sediments 56 biogenic 56 apatite 56 lithosphere 56 labile 56 anions 56 anisotropy 56 adsorbed 56 solar irradiance 56 naturally occurring 55 bilayer 55 terrestrial ecosystems 55 iron oxides 55 mtDNA 55 GPa 55 silicate 55 silicates 55 Supplementary Fig 55 dimer 55 calcareous 55 prokaryotes 55 isotopes 55 diatoms 55 sediment cores 54 anion 54 calcite 54 crystalline structure 54 fluxes 54 carbonaceous 54 chirality 54 mineralogy 54 sulphates 54 microstructures 54 cuprates 54 igneous 54 mRNA expression 54 analyte 54 continental crust 54 ejecta 54 gene expression patterns 54 concentrations 54 magmatic 54 naturally occuring 54 archaea 54 electrical conductivity 54 sediments 53 melanosomes 53 myoglobin 53 spectroscopic 53 particle sizes 53 infrared spectroscopy 53 oxygen atoms 53 abiotic 53 gene expression profiles 53 morphological 53 adsorb 53 clades 53 sodium potassium 53 alpha particles 53 dimers 53 carbon isotope 53 spectra 53 SiO2 53 conductance 53 organic molecules 53 phylogeny 53 planktonic 53 planetary nebulae 53 lunar soil 53 mid latitudes